//
//  MainTabBar.swift
//  sinazd
//
//  Created by apple on 16/3/6.
//  Copyright © 2016年 apple. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {

    
    //重写init，它只会调用一次，可以在此函数中添加中间那个按钮
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        addSubview(plusBtn)
    }

    required init?(coder aDecoder: NSCoder) {
       super.init(coder: aDecoder)
    }
    
    //在这个函数中，修改tabbaritem的frame 和plusBtn的frame
    override func layoutSubviews() {
        super.layoutSubviews()
        let w = UIScreen.mainScreen().bounds.width/5
        let h = self.bounds.height
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
        //定义一个递增的索引
        var index:CGFloat = 0
        
        for subview in subviews{
            
            if subview .isKindOfClass(NSClassFromString("UITabBarButton")!){
                
                
                subview.frame = CGRectOffset(rect, w * index, 0)
                
                index += index == 1 ? 2 : 1
                
                
            }
            
            
        }
        
        plusBtn.frame = CGRectOffset(rect, w * 2, 0)
        
        
    }
    
    
    
    
    
    //懒加载按钮
    //lazy var plusBtn:UIButton = UIButton.buttonWithImage("tabbar_compose_icon_add", backImageName: "tabbar_compose_button")
    
    lazy var plusBtn:UIButton = UIFactory.buttonWithImage("tabbar_compose_icon_add", backImageName: "tabbar_compose_button")
    
    
//    {
//        
//        //实例化一个btn
//        let btn = UIButton()
//        //设置btn
//        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: .Normal)
//        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: .Highlighted)
//        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: .Normal)
//        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: .Highlighted)
//        
//        return btn
//    }()
    
   
    

    
    

}
